Stretchable wiring board

Abstract

A stretchable wiring board that includes: a stretchable substrate having a first main surface and a second main surface facing each other in a thickness direction; a wiring member on at least the first main surface side of the stretchable substrate and including at least one stretchable wiring extending in a plane direction including a length direction orthogonal to the thickness direction and a width direction orthogonal to the thickness direction and the length direction; a protective member covering at least one of the first main surface and the second main surface of the stretchable substrate; and a film member on at least one of the stretchable substrate side and a side opposite to the stretchable substrate with respect to the protective member, wherein the film member is constructed such that an appearance of the film member is irreversibly changed when the film member is stretched in the length direction.

1 . A stretchable wiring board comprising:
 a stretchable substrate having a first main surface and a second main surface facing each other in a thickness direction;   a wiring member on at least the first main surface side of the stretchable substrate and including at least one stretchable wiring extending in a plane direction including a length direction orthogonal to the thickness direction and a width direction orthogonal to the thickness direction and the length direction;   a protective member that covers at least one of the first main surface and the second main surface of the stretchable substrate; and   a film member on at least one of the stretchable substrate side and a side opposite to the stretchable substrate with respect to the protective member,   wherein the film member is constructed such that an appearance of the film member is irreversibly changed when the film member is stretched in the length direction.   
     
     
         2 . The stretchable wiring board according to  claim 1 , wherein the film member is constructed to change from a transparent state to an opaque state when stretched in the length direction. 
     
     
         3 . The stretchable wiring board according to  claim 2 , wherein the film member is made from resin that changes from an amorphous state to a crystalline state when the film member is stretched in the length direction. 
     
     
         4 . The stretchable wiring board according to  claim 3 , wherein a constituent material of the film member is polyethylene. 
     
     
         5 . The stretchable wiring board according to  claim 1 , wherein a tensile strength in the length direction of the film member is lower than a tensile strength in the length direction of the wiring member. 
     
     
         6 . The stretchable wiring board according to  claim 1 , wherein the film member includes a cut configured to be broken when stretched in the length direction. 
     
     
         7 . The stretchable wiring board according to  claim 6 , wherein the cut extends along the width direction. 
     
     
         8 . The stretchable wiring board according to  claim 6 , wherein the film member is made from non-stretchable resin. 
     
     
         9 . The stretchable wiring board according to  claim 8 , wherein a constituent material of the film member is at least one of polyethylene terephthalate and polyimide. 
     
     
         10 . The stretchable wiring board according to  claim 1 , wherein
 the stretchable substrate has a narrow portion having a smallest sectional area when a section orthogonal to the length direction is viewed, and   the film member is at a position overlapping the narrow portion when viewed from the thickness direction.   
     
     
         11 . The stretchable wiring board according to  claim 10 , wherein the film member is constructed to change from a transparent state to an opaque state when stretched in the length direction. 
     
     
         12 . The stretchable wiring board according to  claim 11 , wherein the film member is made from resin that changes from an amorphous state to a crystalline state when the film member is stretched in the length direction. 
     
     
         13 . The stretchable wiring board according to  claim 12 , wherein a constituent material of the film member is polyethylene. 
     
     
         14 . The stretchable wiring board according to  claim 10 , wherein a tensile strength in the length direction of the film member is lower than a tensile strength in the length direction of the wiring member. 
     
     
         15 . The stretchable wiring board according to  claim 10 , wherein the film member includes a cut configured to be broken when stretched in the length direction. 
     
     
         16 . The stretchable wiring board according to  claim 15 , wherein the cut extends along the width direction. 
     
     
         17 . The stretchable wiring board according to  claim 15 , wherein the film member is made from non-stretchable resin. 
     
     
         18 . The stretchable wiring board according to  claim 17 , wherein a constituent material of the film member is at least one of polyethylene terephthalate and polyimide. 
     
     
         19 . The stretchable wiring board according to  claim 1 , wherein the film member is on a side opposite to the stretchable substrate with respect to the protective member.